Don't allow reassigning reported hours to the project if issue is a required field for time logs (#28110).

Patch by Marius BALTEANU.


git-svn-id: http://svn.redmine.org/redmine/trunk@17199 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/issues_controller.rb

@@ -367,7 +367,12 @@ class IssuesController < ApplicationController
       when 'destroy'
         # nothing to do
       when 'nullify'
+        if Setting.timelog_required_fields.include?('issue_id')
+          flash.now[:error] = l(:field_issue) + " " + ::I18n.t('activerecord.errors.messages.blank')
+          return
+        else
         time_entries.update_all(:issue_id => nil)
+        end
       when 'reassign'
         reassign_to = @project && @project.issues.find_by_id(params[:reassign_to_id])
         if reassign_to.nil?